1890 – The US Census Bureau began using Herman Hollerith’s tabulating machine for the first time. This gave Hollerith the basis to later found his Tabulating Machine Company, which was one of four companies that merged to form IBM. http://www.ci.glendale.ca.us/library/this_week_in_reading_0601-0607.asp
1944 – The Colossus Mark 2 was put into service at Bletchley Park in Great Britain, just in time for the invasion at Normandy. http://books.google.com/books?id=gfL4ky-TQOMC&pg=PA80&lpg=PA80&dq=june+1+1944+colossus&source=bl&ots=LZ3i_tbzIt&sig=8RKO7B38Hpxplje8ydxyToLLB8E&hl=en&sa=X&ei=mr6iT5WVLuqciALEgaWMBw&ved=0CDgQ6AEwAw
1999 – The Windows version of music-sharing program Napster was released. http://www.oldapps.com/napster.php
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